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Title: Bandwidth and Electron Correlation-Tuned Superconductivity in Rb0.8Fe2(Se1-zSz)2

We present a systematic angle-resolved photoemission spectroscopy study of the substitution dependence of the electronic structure of Rb0.8Fe2(Se1-zSz)2 (z=0, 0.5, 1), where superconductivity is continuously suppressed into a metallic phase. Going from the nonsuperconducting Rb0.8Fe2S2 to superconducting Rb0.8Fe2Se2, we observe little change of the Fermi surface topology, but a reduction of the overall bandwidth by a factor of 2. Hence, for these heavily electron-doped iron chalcogenides, we have identified electron correlation as explicitly manifested in the quasiparticle bandwidth to be the important tuning parameter for superconductivity, and that moderate correlation is essential to achieving high TC.
Authors:
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Publication Date:
OSTI Identifier:
1263426
Report Number(s):
SLAC-PUB--16612
Journal ID: ISSN 0031-9007; PRLTAO; arXiv:1505.06636
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 115; Journal Issue: 25
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY MATSCI